Single Pfizer vaccine dose yields strong protection for those who've been infected: UK studies |
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Single Pfizer vaccine dose yields strong protection for those who've been infected: UK studies

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Just a single dose of Pfizer-BioNTech COVID-19 vaccine can produce an immune response in people who have already been infected with COVID-19 which is robust enough to protect them from future infection, suggest two new papers published in The Lancet.

One of the two new papers involved data on 51 healthcare workers in London. Twenty four of them had previously had COVID-19. All of these healthcare workers received a first dose of the Pfizer-BioNTech vaccine and were tested for antibodies 19 to 29 days later. Among the participants who had had a previous natural infection, vaccination heightened their antibody levels over 140-times. The second paper presented data on 72 healthcare workers vaccinated in late December. Twenty one of them had had previous infection. Those who had had a previous COVID-19 infection developed stronger immune responses to one dose of vaccine compared to those who had not been infected… (CNN, February 26, 2021)
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